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crewcabshorty 09-03-2017 08:57 PM

4l80 adapter
I am putting a 4l80 in my 1985 k30 . I have a 241 transfer case to put behind it . I am having a hard time finding a adapter to connect the two . Are they available?

mongocanfly 09-03-2017 10:28 PM

Re: 4l80 adapter
I just looked thru advance adapters and novak..neither have one ,and if they don't, good chance nobody does..found a factory one on ebay but when I pulled it up it says sold..something i read on pirates 4x4 says it may have came only in 89-91 2500 suburbans

mongocanfly 09-03-2017 10:50 PM

Re: 4l80 adapter
found this in your neck of the woods....

OldCreek 09-04-2017 02:21 AM

Re: 4l80 adapter
Driver drop 4l80e/np241 adapters should work on passenger drop np241/np208 cases,iirc...

Maybe this broadens your search?


87Skier 09-04-2017 02:33 AM

Re: 4l80 adapter
I looked at putting a 4L80 in my 89 suburban. I read that the adapter in my truck bolts to the 4L80 but a spacer is needed. What does your adapter look like? I thought all turbo 400 had the same output flange and shaft as the early 4L80's.

sweetk30 09-04-2017 10:11 PM

Re: 4l80 adapter
2 Attachment(s)
the 4l80-e has a tiny bit different ring cast in the adapter were the BIG square cut o-ring sits from a th400 . also th400 adapters have feet forward for the mount to bolt on the bottom and these hit the case of a 4l80-e . true 4l80-e adapter has feet rear word .

th400/round 205 adapter = pic 1 and feet forward .

4l80-e/round 205 adapter = pic 2 feet rearward .

i know not for 241 case but shows the idea .

sweetk30 09-04-2017 10:14 PM

Re: 4l80 adapter
3 Attachment(s)
then that difference i was talking about and a spacer ring a guy made for his combo .

i do also know in the 205 adapter family the th400 unit is a tad shorter/thinner than the 4l80-e unit . so the spacer serves 2 things . spacer to make this up and conversion of the ring size difference .

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